Sorry, but without some degree of detail it's quite difficult to offer
anything meaningful. My only guess is that you've received the "doc" from a
WinWord user who has protected parts of it. Protection schemes are more
robust in the recent Windows versions, but you can try Tools> Unprotect
Document. If the Protection isn't password protected or if the sender
provides the password you may be able to turn the protection off.
If Protection isn't the issue you'll need to be much more descriptive of the
source of the document, the type of content you're trying to delete, how
you're going about editing the file & what - specifically - happens or
doesn't happen contrary to your expectations. Any details you can supply
could be important.
Regards |:>)
Bob Jones
[MVP] Office:Mac